Arbor for mill advice

[pjf134]

I have a Sherline 2000 CNC mill with a rotary table and I want to make some gears with it. I need to make a arbor for it to hold the blank. I was thinking of using 2 threaded nuts to hold the blank on the arbor and was wondering if anyone tried this before. I was thinking of making it a small dia. rod and enlarging the center of the gear after it was cut otherwise I will have to make a few different size arbors. I think I have a tail stock for it and if I don't will have to make one. The mill was free with a box of tooling for it and the Sherline CNC lathe was free too with a box of tooling also. Every gear I made was done on a automatic gear cutter when I worked in a machine shop so this way is new to me. Any input would be appreciated.
Paul